This grows as a weed in my yard and in the power line cut behind my house in relatively dry, sandy soil. It's a semi-erect/semi-trailing plant and the flowers are under a half inch wide.

Hey Biker, Thanks but no apology needed, no harm, no foul, etc. Sometimes we're more clear than others, sometimes not. I have many times misread something ('cause I'm going too fast), or posting on a quick break at work, or way too late at night at home, etc. Well Mike, It's just that I used to word process for a living so I find my own bad proofing is particularly cringe-worthy. But then, as professionals (at law firms) one rarely proofs one's own work for exactly that reason. One tends to see what one wants on the page rather than what's actually there. That's why it's best (professionally) to only proof work one did not create. Glad you understood the caution about the Euphorbia sap. One needs to wash carefully after handling & pay particular attention to avoid the face & all mucous membranes until after thorough washing. It tends to be more relevant on things like E. trigona, lactea, & those types. Mike, what you said about being given cuttings you've never seen before at the nursery. I'll try to say this gently, but just cause you haven't seen a plant before, does't mean it's rare, it's just new to you. The plant world out there is so GIGANTIC, there's oodles to see. Once I started collecting succulents & seeing more than a few, I thought I was getting to see a lot of them. Then I started visiting a friend in San Diego & he showed me plants in person that were just amazing at parks & in special places he knew including their zoo. Turns out the San Diego Zoo w/ its famous collection of animals (made famous on Johnny Carson Show w/ the Zookeeper Joan Embry) has a botanical collection even more valuable than its animal collection; who knew. Go there in Feb. & one can see fields of Aloes blooming around certain animal areas, pretty cool.

Definitely creeping beggarweed or Desmodium incanum. I found it on Weedalert.com From that site: Cultural Practices: Creeping beggarweed can be difficult to control due to its spreading ability by deep rhizomes. The plant also produces jointed seedpods that can be physically distributed. Beggarweed can tolerate close mowing. A dense turf produced by proper fertility practices and adequate irrigation to prevent moisture stress is the best practices to compete with beggarweed. Physical removal is difficult due to the deep rhizomes. Herbicide Use: For optimum control, make your postemergent herbicide application to creeping beggarweed that is young and actively growing. Here is a link that might be useful: Beggarweed

There are hundreds, if not thousands, of Rhododendrons: species, hybrids and cultivars. Unless you know your neighbours have exactly the same plant comparisons are not meaningful. Apart from which yours might just be younger.